/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.io.encoding;

import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.KeyValueUtil;
import org.apache.hadoop.hbase.PrivateCellUtil;
import org.apache.hadoop.io.WritableUtils;
import org.apache.yetus.audience.InterfaceAudience;

@InterfaceAudience.Private
public class NoneEncoder {

    private DataOutputStream out;
    private HFileBlockDefaultEncodingContext encodingCtx;

    public NoneEncoder(DataOutputStream out, HFileBlockDefaultEncodingContext encodingCtx) {
        this.out = out;
        this.encodingCtx = encodingCtx;
    }

    public int write(Cell cell) throws IOException {

        /********
         * TODO_MA 马中华 https://blog.csdn.net/zhongqi2513
         *   注释：
         */
        // We write tags seperately because though there is no tag in KV
        // if the hfilecontext says include tags we need the tags length to be written
        int size = KeyValueUtil.oswrite(cell, out, false);

        // Write the additional tag into the stream
        if(encodingCtx.getHFileContext().isIncludesTags()) {
            int tagsLength = cell.getTagsLength();
            out.writeShort(tagsLength);
            if(tagsLength > 0) {
                PrivateCellUtil.writeTags(out, cell, tagsLength);
            }
            size += tagsLength + KeyValue.TAGS_LENGTH_SIZE;
        }
        if(encodingCtx.getHFileContext().isIncludesMvcc()) {
            WritableUtils.writeVLong(out, cell.getSequenceId());
            size += WritableUtils.getVIntSize(cell.getSequenceId());
        }
        return size;
    }

}
